Capsule Sinkers

Floating dosage forms rarely dissolve at a reproducible rate. Using a sinker in Apparatus 2 fixes the dosage form to a certain point and aids reproducibility. Sinkers can also be useful where dosage forms may stick to the sides of the vessel.

General guidelines to consider when choosing a sinker for your application include:

Sinker Size - the sinker should have minimal surface contact with the tablet as this can affect the dissolution rate.

Sinker Weight - should be kept to a minimum - just enough to have a desired effect.

PTFE Coated Sinkers Magnetic - used with magnetic retrieval systems, or where there may be a reaction between steel and the tablet.